Last official estimated population of Alamosa County was 15,901 (year 2014)[1]. This was 0.005% of total US population and 0.3% of total Colorado state population. Area of Alamosa County is 723.4 mi² (=1873.5 km²), in this year population density was 21.98 p/mi². If population growth rate would be same as in period 2010-2014 (+0.73%/yr), Alamosa County population in 2026 would be 17,351 [0].
Historical population of Alamosa County for period 1890-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position
[1890-1900] NAN %/yr
[1900-1910] NAN %/yr
[1910-1920] +INF %/yr
[1920-1930] +5.27 %/yr
[1930-1940] +2 %/yr
[1940-1950] +0.04 %/yr
[1950-1960] -0.52 %/yr
[1960-1970] +1.34 %/yr
[1970-1980] +0.33 %/yr
[1980-1990] +1.44 %/yr
[1990-2000] +0.95 %/yr
[2000-2005] +0.36 %/yr
[2005-2010] +0.27 %/yr
[2010-2014] +0.73 %/yr
Looking for settlements in Alamosa County? Visit this page: Settlements in Alamosa County, CO
Population of Alamosa County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 627 | 611 | 1,238 |
| 5 to 9 | 569 | 545 | 1,114 |
| 10 to 14 | 515 | 455 | 970 |
| 15 to 19 | 777 | 736 | 1,513 |
| 20 to 24 | 952 | 948 | 1,900 |
| 25 to 29 | 657 | 527 | 1,184 |
| 30 to 34 | 501 | 486 | 987 |
| 35 to 39 | 430 | 415 | 845 |
| 40 to 44 | 400 | 363 | 763 |
| 45 to 49 | 392 | 418 | 810 |
| 50 to 54 | 464 | 467 | 931 |
| 55 to 59 | 488 | 522 | 1,010 |
| 60 to 64 | 426 | 443 | 869 |
| 65 to 69 | 343 | 359 | 702 |
| 70 to 74 | 248 | 252 | 500 |
| 75 to 79 | 175 | 190 | 365 |
| 80 to 84 | 92 | 127 | 219 |
| 85+ | 102 | 155 | 257 |
Alamosa County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| WAC | 7357 | 7301 | 14,658 |
| WA | 7111 | 7090 | 14,201 |
| NH | 4439 | 4384 | 8,823 |
| NHWAC | 4117 | 4131 | 8,248 |
| NHWA | 3994 | 4008 | 8,002 |
| H | 3719 | 3635 | 7,354 |
| HWAC | 3240 | 3170 | 6,410 |
| HWA | 3117 | 3082 | 6,199 |
| IAC | 585 | 545 | 1,130 |
| IA | 456 | 428 | 884 |
| HIAC | 426 | 392 | 818 |
| HIA | 352 | 329 | 681 |
| TOM | 261 | 226 | 487 |
| BAC | 274 | 186 | 460 |
| AAC | 183 | 178 | 361 |
| NHIAC | 159 | 153 | 312 |
| BA | 190 | 118 | 308 |
| NHBAC | 191 | 101 | 292 |
| NHTOM | 137 | 133 | 270 |
| AA | 124 | 131 | 255 |
| NHAAC | 102 | 120 | 222 |
| HTOM | 124 | 93 | 217 |
| NHIA | 104 | 99 | 203 |
| NHBA | 136 | 54 | 190 |
| HBAC | 83 | 85 | 168 |
| NHAA | 61 | 85 | 146 |
| HAAC | 81 | 58 | 139 |
| HBA | 54 | 64 | 118 |
| HAA | 63 | 46 | 109 |
| NAC | 27 | 44 | 71 |
| NA | 16 | 26 | 42 |
| HNAC | 14 | 25 | 39 |
| NHNAC | 13 | 19 | 32 |
| HNA | 9 | 21 | 30 |
| NHNA | 7 | 5 | 12 |
• Fremont County population
64.4 mi, 
17°
• Taos County
69 mi, 
173°
• Archuleta County
73.8 mi, 
249°
• Rio Grande County
36.9 mi, 
261°
• Conejos County
32.5 mi, 
220°
• Huerfano County
46.1 mi, 
79°
• Saguache County
40.2 mi, 
322°
• Custer County
43.2 mi, 
31°
• Costilla County
28.1 mi, 
135°
• Mineral County
62.9 mi, 
275°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*Costilla, Conejos Colorado Notes
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